Bronchial carcinoid with bronchocele masquerading as Scimitar syndrome on chest radiograph

Bronchial carcinoid tumors occur predominantly in the perihilar location and can be asymptomatic. They may present in early stages with only obstructive features such as mucus plugging of airways resulting in bronchocele formation. We report the case of a 44-year lady with no chest complaints, who underwent chest radiograph for a routine preanesthetic checkup. A vertically oriented, tubular, soft tissue density lesion was observed in the right lower lung, which mimicked a Scimitar vein. Scimitar syndrome is a congenital disorder in which an anomalous vein drains the middle and lower lobes of right lung and enters into the IVC most commonly. It may present asymptomatically in adults and on chest radiograph appears as a vertical tubular opacity paralleling the right cardiac border. However, CT angiography revealed the lung lesion to be a bronchocele, distal to a central intensely enhancing spherical mass, completely occluding the right lower lobe bronchus. This perihilar mass had been missed on the chest radiograph. Bronchoscopic biopsy revealed a carcinoid tumor. As the patient was asymptomatic, she refused surgery in the ongoing COVID-19 pandemic.